1. Spacecraft tracking could look for a similar precession of Mars's orbit. ������̫�մ���Ҳ������Ѱ���ǹ�����ƵĽ�����
2. Due to lunar precession, this time is longer than that if the perigee's position was fixed. ���������Ĺ�ϵ�����ʱ��Ƚ��ص㲻������������֮ʱ�䳤��
3. We used weak pulses of light to monitor the precession, in effect obtaining stroboscopic images of the spin dynamics. �����������������۲������ȡ���������˶���Ƶ���۲�Ӱ��
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n.
1. the motion of a spinning body (as a top) in which it wobbles so that the axis of rotation sweeps out
2. the act of preceding in time or order or rank (as in a ceremony)
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backward precession ������;
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orbital precession �������;
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